Sink



FIG. 1 is a front top perspective view of a sink embodying my design

FIG. 2 is a left, front top perspective view thereof

FIG. 3 is a top plan view thereof;

FIG. 4 is an bottom plan view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a top plan view of an alternative embodiment of my new design.

The broken line showing of plumbing holes is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a sink, as shown and described. 